Cushion spring construction



Jan. 26, 19252. A, C, W|SNER v 1,842,439

Y CUSHIONvsPRING CONSTRCTION 1 Fild March 26. 19281 2 sneetsfsheet 2l Patentedl Jan. 26, 1932 UNITED STATES PATENT OFFICE ABRAM'C. WISNER, 0F JACKSON, MICHIGAN, SSIS-NOR 'P0-REYNOLDS SPRING COM- PANY, F JACKSON, MICHIGAN, A COBPORATICN 0F MICHIGAN l CUSHION SPRING CONSTRUQTIN Application filed Hai-ch 26, 1928. Serial No. 234,9l'?.

ythese springs, there remains substantial areas in which the upholstery material is unsupported. For the same' reason the load placed n, upon the structure is likewise unsupported at definite areas, and the result is undue strain, distortion and wear of the upholstery material at these unsupported areas.

The present invention aims to avoid such unsupported areas by the insertion of flat coil springs between t e tops of the elongated springs. The inserted springs are preferably of such size as to lie tangent to the tops of the elongated springs forming a given space and are secured to the elongated springs at the points of tangency. The 'top structure further includes fiat coil springs disposed with the tops of the elongated springs, so that the unsupported areas within the elongated springs are similarly reduced. The latter group of Hat springs maybe formed as integral parts of the elongated springs, and in such case would merely be formed 1n continuation of the uppermost convolution and would be coiled substantially coaxially of the elongated springs.

The invention is fully disclosed by Way of example in the following description and in the accompanying drawings, in which'- Figure l is a plan view of a spring cushion structure built according to the invention;

Fig. 2 is a transverse section thereof; gig. 3 is a detail perspective view thereof; an

-Fig. 4 is a perspective view of a modiiied form of elongated spring.

Reference to these views will now be made by use of like characters which are employed to designate corresponding parts throughout.

The spring assembly is held together by a lower wire frame 1 and a similarly shaped top wire frame 2 as shown more clearly in ,liti

these springs considerably from each other. i

Due to such spacing and also to the open condition of the tops of the elongated springs, the points of support for the load sustained by the structure are distributed rather scarcely in the plane of the frame 2.

ln order to improve this condition I pro vide a top structure consisting of a series of flat coil springs 6 clipped tangentially to each other and disposed in the Vplane of the upper frame 2. Certain of the flat springs lie within the spaces between the springs 3 and are clipped tangentially to the upper convolu-` tions of the latter springs as indicated by the numeral 7. The remaining ilat springs are positioned within the tops of the springs 3 and secured thereto also by the clips 7.

lt will also be seen by reference to Figures l and 3 that the upper end of each of the springs 3 is bent inwardly as at 9 without being knotted. In this manner the operation of'knotting is avoided, and the bent end 9 further extends beneath the plane of the to ott the sprin so that it is available for ta 'ng some of t e load of the inserted dat springs 6 if necessary. l

Figure 4 illustrates a modification of the elongated spring wherein the dat coil disposed within the uppermost convolution is an integral part. This flat spring 6 is merely wound in continuation of the uppermost convolution and is formed toglie coaxially with the elongated spring in the same manner as the separate inner springs 6.. This particular construction reduces the number of free Wire ends which are always liable to puncture the overlaid upholstery material.

lt will now be apparent that the upper structure of flat springs 6 and 6 considerablyV lll@ most convolutions of the elongated springs.

Although s ecilic embodiments of the 1nvention have een illustrated and described, ,s

it will be understood that various alterations in the details of construction may be made without departing from the scope of the invention as indicated by the'appended claims.

What I claim is :s-

1. In a spring construction comprising axially elongated coil springs having their to sin a common plane and spaced from each ot springs in said plane and within said elongated springs, and inde endent fiat coil springs 1n said plane an secured directly to said tops in the spaces defined by said elongated coil springs.

2. In a sprin construction comprising axially elongate coil springs having each a coaxial flat top coil, said to coils bein in a common plane and spaced rom each ot er, the combination of flat coil springs disposed in the spaces between said coils and secured 'f tangentlally to said coils.

In testimony whereof I aix my signature. ABRAM C. WISNER.

er, a top. structure consisting of flat coil l 

